package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，实现@AutoFill注解实现自动填充公共字段
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 定义切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知，通知前对公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("执行公共字段自动填充...");
        //获取拦截的操作类型
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); //获取方法签名
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class); //获取方法上的注解对象
        OperationType operationType=autoFill.value(); //获取数据库操作枚举类型
        //获取被拦截方法的方法参数
        Object[] args=joinPoint.getArgs();
        if(args==null || args.length==0){
            return;
        }
        Object entity=args[0]; //本程序默认将实体类放到首位传参
        //修改参数属性
        LocalDateTime now= LocalDateTime.now();
        Long id= BaseContext.getCurrentId();
        if(operationType==OperationType.INSERT){
            //反射赋值
            try {
                Method setCreateTime=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);
            }catch(NoSuchMethodException | IllegalAccessException | InvocationTargetException ex){
                ex.printStackTrace();
            }
        }else if(operationType==OperationType.UPDATE){
            try{
                Method setUpdateTime=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);
            }catch(NoSuchMethodException | IllegalAccessException | InvocationTargetException ex){
                ex.printStackTrace();
            }
        }
    }
}
